The RCT version was new when I got it but was missing an important part.
Finally got another one of these M36 models in my collection

The M36 was the most potent Sherman M4 variant with its 90mm HV gun.
Oh and this one is a REMOTE CONTROL TANK motorized version which makes it ready for RRC conversion

Here is a very good yputube video of the history of this
M4 Sherman based Tank Destroyer
https://www.youtube.com/watch?v=dr6FF_zqGNY
The M36 is the successor to the M10 TD.
I have found the Sherman based M4 Chassis to be the best 1/35 model chassis to convert to RRC due to its excellent robust track system. It takes less power to run the tracks on a M4 chassis and if properly tensioned, rarely if ever throws a track.